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Protandry (male reproductive organs maturing before female organs) and dioecious plants (having separate male and female plants) are mechanisms that actively promote or require cross-pollination to prevent self-pollination. Monoecious plants have both male and female flowers on the same plant, which allows for both self and cross-pollination. Polygyny is a zoological term referring to a mating system where one male mates with multiple females, and it is not a botanical condition that supports or affects cross-pollination in plants. Therefore, it is the exception.